Replaced PassRefPtr copies with moves in Source/core.

third_party/WebKit/Source/core/layout/LayoutTextCombine.cpp

 /*
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #include "core/layout/LayoutTextCombine.h"
 
 #include "platform/graphics/GraphicsContext.h"
 
 namespace blink {
 
 const float textCombineMargin = 1.1f; // Allow em + 10% margin
 
 LayoutTextCombine::LayoutTextCombine(Node* node, PassRefPtr<StringImpl> string)
-    : LayoutText(node, string)
+    : LayoutText(node, std::move(string))
     , m_combinedTextWidth(0)
     , m_scaleX(1.0f)
     , m_isCombined(false)
     , m_needsFontUpdate(false)
 {
 }
 
 void LayoutTextCombine::styleDidChange(StyleDifference diff, const ComputedStyle* oldStyle)
 {
     setStyleInternal(ComputedStyle::clone(styleRef()));
     LayoutText::styleDidChange(diff, oldStyle);
 
     updateIsCombined();
 }
 
 void LayoutTextCombine::setTextInternal(PassRefPtr<StringImpl> text)
 {
-    LayoutText::setTextInternal(text);
+    LayoutText::setTextInternal(std::move(text));
 
     updateIsCombined();
 }
 
 float LayoutTextCombine::width(unsigned from, unsigned length, const Font& font, LayoutUnit xPosition, TextDirection direction, HashSet<const SimpleFontData*>* fallbackFonts, FloatRect* glyphBounds) const
 {
     if (!length)
         return 0;
 
     if (hasEmptyText())
@@ skipping 111 matching lines @@
         } else {
             m_scaleX = 1.0f;
         }
     }
 
     if (shouldUpdateFont)
         style()->font().update(fontSelector);
 }
 
 } // namespace blink